Do Kaplan Lecture notes change each year?

[OphthLover]

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I currently have 2010 version of all Kaplan LN. I think the most recent version that's available in the market is 2013 version. Are the changes made each year (total of 3 years for me) significant enough that I should be purchasing the new version of the lecture notes? Thank you for your comments in advance.

 

[Prince090]

2014 edition is also in the market.